mod_pagespeed is an open-source Apache module which automatically applies web performance best practices to pages, and associated assets (CSS, JavaScript, images) without requiring that you modify your existing content or workflow.

mod_pagespeed is built on PageSpeed Optimization Libraries, deployed across 100,000+ web-sites, and provided by popular hosting and CDN providers such as DreamHost, GoDaddy, EdgeCast, and others. There are 40+ available optimizations filters, which include:

Curious to learn more about mod_pagespeed? Check out our GDL episode below, which covers the history of the project, an architectural overview of how mod_pagespeed works under the hood, and a number of operational tips and best practices for deploying mod_pagespeed.